Shimano Deore CS-M4100 10-Speed CassetteThe Deore M4100 10-Speed Dyna-Sys cassette features a light weight minimal design sprocket carrier. The 3 largest sprockets are mounted on a lightweight alloy carrier to reduce weight and increase rigidity.Hyperglide sprockets have a computer designed tooth configuration with contoured shift gates, resulting in a crisp smooth shift even under loadClose ratio gearing allows a more efficient use of energy through finer cadence controlSprockets are cut away and drilled to reduce weight without reducing rigidityFor 10-speed HG-X MTB chains